diff --git a/pyproject.toml b/pyproject.toml
index e6f9d1d..5337fed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rda_python_common"
-version = "1.0.15"
+version = "1.0.16"
 authors = [
   { name="Zaihua Ji", email="zji@ucar.edu" },
 ]
diff --git a/src/rda_python_common/PgDBI.py b/src/rda_python_common/PgDBI.py
index d6c10e7..b7c6733 100644
--- a/src/rda_python_common/PgDBI.py
+++ b/src/rda_python_common/PgDBI.py
@@ -236,7 +236,6 @@ def set_dbname(scname = None, lnname = None, pwname = None, dbhost = None, dbpor
 #
 def set_scname(dbname = None, scname = None, lnname = None, pwname = None, dbhost = None, dbport = None, socket = None):
 
-   global pgdb
    changed = 0
 
    if dbname and dbname != PGDBI['DBNAME']:
@@ -274,7 +273,6 @@ def set_scname(dbname = None, scname = None, lnname = None, pwname = None, dbhos
 def starttran():
 
    global curtran
-   global pgdb
 
    if curtran == 1: endtran()   # try to end previous transaction
    if not pgdb:
@@ -296,7 +294,6 @@ def starttran():
 def endtran(autocommit = True):
 
    global curtran
-   global pgdb
    if curtran and pgdb:
       if not pgdb.closed: pgdb.commit()
       pgdb.autocommit = autocommit
@@ -308,7 +305,6 @@ def endtran(autocommit = True):
 def aborttran(autocommit = True):
 
    global curtran
-   global pgdb
    if curtran and pgdb:
       if not pgdb.closed: pgdb.rollback()
       pgdb.autocommit = autocommit
@@ -535,7 +531,6 @@ def pgconnect(reconnect = 0, pgcnt = 0, autocommit = True):
 #
 def pgcursor():
 
-   global pgdb
    pgcur = None
 
    if not pgdb:
diff --git a/src/rda_python_common/PgLOG.py b/src/rda_python_common/PgLOG.py
index 93cc8dd..511843c 100644
--- a/src/rda_python_common/PgLOG.py
+++ b/src/rda_python_common/PgLOG.py
@@ -564,7 +564,7 @@ def set_help_path(progfile):
 #
 def show_usage(progname, opts = None):
 
-   if PGLOG['PUSGDIR'] is None: set_help_path(get_caller_file())
+   if PGLOG['PUSGDIR'] is None: set_help_path(get_caller_file(1))
    usgname = join_paths(PGLOG['PUSGDIR'], progname + '.usg')
 
    if opts: